If you want to tell the authenticity of gold, you can look at the color. According to the different luster of gold, gold can be roughly divided into pure gold, k gold, real gold and fake gold. In other words, red and yellow are the best for gold, and the fineness is above 95%; The fineness of true yellow is about 80%; The blue-yellow color accounts for about 70%; The fineness of yellow with gray is about 50%, so there is a formula of "seven green, eight yellow, nine five red, yellow and white with gray and half gold".
If you want to distinguish between true and false gold, you can also look at its importance, and this can also be seen. Compared with other materials, the proportion of gold is relatively high. A small piece of gold jewelry may feel like falling, but copper of the same size will not fall and will become lighter. This is because the density of gold is relatively high. After understanding this feature, you can use real gold jewelry to weigh and find the feeling. This feeling is obvious. You will have a deeper understanding when you identify gold jewelry in the future.
If you want to distinguish the authenticity of gold, you can also look at its hardness, which can also be seen. When we watch TV, usually in costume movies and TV series, there may be such a plot that someone bites gold with their teeth to distinguish between true and false. Pure gold has a low hardness. Biting will leave teeth marks. Therefore, when identifying pure gold, you can try its hardness. If the hardness is too high, it cannot be pure gold.